A community center rents their hall for special events. They charge a fixed fee of $200 plus an hourly fee of $22.50. How much would it cost Lin to rent the community center for 3 hours?

another community center rents their hall for special events. They charge a fixed fee of $200 plus an hourly fee of $22.50.

Write an expression to represent this situation using for the number of hours.

Assume that there is a 11% rate of disk drive failure in a year. a. if all your computer data is stored on a hard disk drive with a copy stored on a second hard disk drive, what is the probability that during a year, you can avoid catastrophe with at least one working drive? b. if copies of all your computer data are stored on four independent hard disk drives, what is the probability that during a year, you can avoid catastrophe with at least one working drive?